Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 73, NWS Lincoln, IL

September 19, 1986McLean County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Sep 19, 1986, 9:02 PM CDT for McLean County, Illinois. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: Sep 19, 1986, 9:02 PM CDT (02:02 UTC)
Expired: Sep 19, 1986, 10:00 PM CDT
In force: 58 min
Issued by: NWS Lincoln, IL
Area: Whole counties

County McLean County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 00:00Z, 2.0 hours before the alert went out and 67 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1948 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 450 m²/s²
Significant tornado parameter: 4.6
Supercell composite: 34.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPIA 200204 RRA
SVRPIA
ILC113-200300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING   ....CORRECTION FOR LOCATION OF STORM...
NATIONAL WEATHER SERVICE PEORIA IL
902 PM CDT FRI SEP 19 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 1000 PM CDT FOR PEOPLE IN THE FOLLOWING
COUNTY OF

CENTRAL ILLINOIS...MCLEAN

RADAR INDICATES A STRONG THUNDERSTORM 5 MILES NORTH NORTHEAST
OF BLOOMINGTON ILLINOIS.  THIS STORM IS MOVING TOWARD THE
EAST SOUTHEAST AT 20 MILES AN HOUR.
WINDS TO 40 TO 45 MILES AN HOUR AND ONE HALF INCH HAIL WERE
REPORTED WITH THIS STORM ABOUT 850 PM.

 REMEMBER A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN
 EXCESS OF 60 MPH...LAR\GE HAIL...DEADLY LIGHTNING...AND HEAVY RAIN
 THAT CAN QUICKLY FLOOD A LOW LYING AREA.

ATTN ISP 6

STARK

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Sep 19, 6:14 PM CDT, 2 hours 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
610 PM CDT FRI SEP 19 1986

AN AREA OF SHOWERS AND THUNDERSTORMS HAS DEVELOPED ACROSS CENTRAL
ILLINOIS... EXTENDING FROM NEAR KANKAKEE ACROSS JUST NORTH OF
PEORIA...THROUGH PRINCEVILLE...WYOMING...GALESBURG AND KNOXVILLE
TO NORTH OF BURLINGTON.

THESE STORMS ARE MOVING TOWARD THE EAST BUT SEEM TO BE DEVELOPING
SOUTHWARD.

NO SEVERE WEATHER HAS BEEN INDICATED OR OBSERVED WITH THESE STORHMS.
HOWEVER...SOME OF THEM COULD CONTAIN A PERIOD OF HEAVY RAIN AND
GUSTY WINDS.

STARK

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 20, 12:33 AM CDT	Flash Flood Warning	ILX	DeWitt, Logan	5 hr
Sep 20, 2:46 AM CDT	Flash Flood Warning	ILX	Sangamon	4 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 1986 Every severe thunderstorm warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.